How to tell if the MAF is faulty

done a search for "MAF" with no results. I've got a revo'd 2001 S3 which sometimes goes like stink but other time you can plant you foot and you just don't get that kick as it comes on boost. The acceration also doesn't always feel even in gear. Like the delivery is spikey. Does this sound like a MAF thats dying? Is there any way to confirm it or just a case of buy a new one and hope it cures the problem. How much doe they cost, is it a straight swap or do you have to go to the dealers for a any codes resetting.

dont forget to take into account the warm weather we're currently experiencing. The intercoolers on s3's were audi's idea of a joke, to the point where in hot weather an s3 can sometimes feel like a stock 1.8 NA....... the throttle response can be shocking.

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